Error check for responder_initialize() is broken

[Kaz Nishimura]

The return value must be checked with !=.

It can cause an infinite spinning if another instance is already running.

[Kaz Nishimura]

I will make a fix in a few days.

[Kaz Nishimura]

Corrected the error check for 'responder_init' to fix issue #30.

→ <<cset 3754f5221ba7>>